S-Works Tarmac SL9 vs Cervélo S5 2026: Which Superbike Wins?
TL;DR
The Tarmac SL9 is the better all-round race bike — lighter, more versatile, and brilliant on climbs. The Cervélo S5 is the faster bike in pure aerodynamic terms — better for flat criteriums, time-trial efforts, and riders who prioritise speed over versatility. Both cost £12,000-£14,000 at S-Works/top-spec level.
Head-to-Head Specs
| Spec | S-Works Tarmac SL9 | Cervélo S5 |
|---|---|---|
| Frame Weight | 687g | ~850g |
| Aero | Top 5 (all-round) | Top 2 (specialist) |
| Tyre Clearance | 32mm | 30mm |
| Complete Weight | ~6.5 kg | ~7.2 kg |
| Geometry | Race (balanced) | Race (aggressive) |
| Groupset Options | SRAM Red / Dura-Ace | SRAM Red / Dura-Ace |
| UK Price (top spec) | ~£14,000 | ~£12,500 |
| Best For | All-round racing | Flat/aero racing |
Where the Tarmac SL9 Wins
Direct Answer: The Tarmac SL9 wins on weight, climbing, versatility, and all-round handling. At 687g for the frame vs approximately 850g for the S5, it's significantly lighter. On hilly courses, mixed terrain, and general road riding, the SL9 is the better bike.
- Climbing: 150-200g lighter complete = measurable advantage on climbs
- Versatility: 32mm tyre clearance vs 30mm
- Comfort: More compliant ride over long distances
- Handling: Sharper, more responsive steering
Where the Cervélo S5 Wins
Direct Answer: The S5 is aerodynamically superior in wind tunnel testing. For flat criteriums, breakaway efforts, and any scenario where pure speed on flat or rolling terrain matters most, the S5 has a measurable advantage — likely 5-10 watts at racing speeds.
- Aero: Lower CdA in most wind tunnel tests
- Flat speed: Measurably faster on pancake-flat courses
- Stiffness: Very rigid bottom bracket area for sprinting
- Price: Slightly lower at top spec
Choosing Between Them
| Your Racing | Best Choice |
|---|---|
| Hilly road races | Tarmac SL9 |
| Flat criteriums | Cervélo S5 |
| Stage races (mixed) | Tarmac SL9 |
| Time trials | Cervélo S5 |
| Gran Fondos/sportives | Tarmac SL9 |
| One-bike-does-it-all | Tarmac SL9 |
Test ride the S-Works Tarmac SL9 at Ebikes & Gear Canterbury. We'll help you understand which superbike geometry matches your riding style.
Related: Tarmac SL9 Review | SL9 Aero Claims Tested | S-Works Buyer's Guide
Further reading
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